(PHP 8)
ReflectionProperty::hasDefaultValue — Checks if property has a default value declared
public ReflectionProperty::hasDefaultValue ( ) : bool
Checks whether the property was declared with a default value, including an implicit null default value. Only returns false for typed properties without default value (or dynamic properties).
This function has no parameters.
If the property has any default value (including null) true is returned; if the property is typed without a default value declared or is a dynamic property, false is returned.
Example #1 ReflectionClass::hasDefaultValue() example
<?php
class Foo {
public $bar;
public ?int $baz;
public int $boing;
}
$ro = new ReflectionClass(Foo::class);
var_dump($ro->getProperty('bar')->hasDefaultValue());
var_dump($ro->getProperty('baz')->hasDefaultValue());
var_dump($ro->getProperty('boing')->hasDefaultValue());
?> The above example will output:
bool(true) bool(false) bool(false)
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https://www.php.net/manual/en/reflectionproperty.hasdefaultvalue.php